FIRE STARTED UNDER THE CAR SOMEWHERE BETWEEN THE ENGINE AND TRANSMISSION. GLOW OF THE FLAME WAS TOWARDS THE BACK OF THE ENGINE COMPARTMENT AND TOWARDS THE CENTER OF THE CAR. FIRE WORKED ITS WAY FORWARD AND ENGULFED THE ENGINE COMPARTMENT. CAR WAS IN MOTION EXITING FROM THE HIGHWAY ONTO AN OFF RAMP WHEN ISSUE WAS NOTICED.